// Formatting library for C++ - optional wchar_t and exotic character support
//
// Copyright (c) 2012 - present, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.

#ifndef FMT_XCHAR_H_
#define FMT_XCHAR_H_

#include <cwchar>

#include "format.h"

FMT_BEGIN_NAMESPACE
namespace detail {
template <typename T> using is_exotic_char = bool_constant<!std::is_same<T, char>::value>;
}

FMT_MODULE_EXPORT_BEGIN

using wstring_view = basic_string_view<wchar_t>;
using wformat_parse_context = basic_format_parse_context<wchar_t>;
using wformat_context = buffer_context<wchar_t>;
using wformat_args = basic_format_args<wformat_context>;
using wmemory_buffer = basic_memory_buffer<wchar_t>;

#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409
// Workaround broken conversion on older gcc.
template <typename... Args> using wformat_string = wstring_view;
inline auto runtime(wstring_view s) -> wstring_view { return s; }
#else
template <typename... Args> using wformat_string = basic_format_string<wchar_t, type_identity_t<Args>...>;
inline auto runtime(wstring_view s) -> basic_runtime<wchar_t> { return {{s}}; }
#endif

template <> struct is_char<wchar_t> : std::true_type
{
};
template <> struct is_char<detail::char8_type> : std::true_type
{
};
template <> struct is_char<char16_t> : std::true_type
{
};
template <> struct is_char<char32_t> : std::true_type
{
};

template <typename... Args> constexpr format_arg_store<wformat_context, Args...> make_wformat_args(const Args&... args) { return {args...}; }

inline namespace literals {
#if FMT_USE_USER_DEFINED_LITERALS && !FMT_USE_NONTYPE_TEMPLATE_ARGS
constexpr detail::udl_arg<wchar_t> operator"" _a(const wchar_t* s, size_t) { return {s}; }
#endif
}  // namespace literals

template <typename It, typename Sentinel> auto join(It begin, Sentinel end, wstring_view sep) -> join_view<It, Sentinel, wchar_t> { return {begin, end, sep}; }

template <typename Range> auto join(Range&& range, wstring_view sep) -> join_view<detail::iterator_t<Range>, detail::sentinel_t<Range>, wchar_t>
{
    return join(std::begin(range), std::end(range), sep);
}

template <typename T> auto join(std::initializer_list<T> list, wstring_view sep) -> join_view<const T*, const T*, wchar_t>
{
    return join(std::begin(list), std::end(list), sep);
}

template <typename Char, FMT_ENABLE_IF(!std::is_same<Char, char>::value)>
auto vformat(basic_string_view<Char> format_str, basic_format_args<buffer_context<type_identity_t<Char>>> args) -> std::basic_string<Char>
{
    basic_memory_buffer<Char> buffer;
    detail::vformat_to(buffer, format_str, args);
    return to_string(buffer);
}

template <typename... T> auto format(wformat_string<T...> fmt, T&&... args) -> std::wstring
{
    return vformat(fmt::wstring_view(fmt), fmt::make_wformat_args(args...));
}

// Pass char_t as a default template parameter instead of using
// std::basic_string<char_t<S>> to reduce the symbol size.
template <typename S, typename... Args, typename Char = char_t<S>, FMT_ENABLE_IF(!std::is_same<Char, char>::value && !std::is_same<Char, wchar_t>::value)>
auto format(const S& format_str, Args&&... args) -> std::basic_string<Char>
{
    return vformat(detail::to_string_view(format_str), fmt::make_format_args<buffer_context<Char>>(args...));
}

template <typename Locale, typename S, typename Char = char_t<S>, FMT_ENABLE_IF(detail::is_locale<Locale>::value&& detail::is_exotic_char<Char>::value)>
inline auto vformat(const Locale& loc, const S& format_str, basic_format_args<buffer_context<type_identity_t<Char>>> args) -> std::basic_string<Char>
{
    return detail::vformat(loc, detail::to_string_view(format_str), args);
}

template <typename Locale,
          typename S,
          typename... Args,
          typename Char = char_t<S>,
          FMT_ENABLE_IF(detail::is_locale<Locale>::value&& detail::is_exotic_char<Char>::value)>
inline auto format(const Locale& loc, const S& format_str, Args&&... args) -> std::basic_string<Char>
{
    return detail::vformat(loc, detail::to_string_view(format_str), fmt::make_format_args<buffer_context<Char>>(args...));
}

template <typename OutputIt,
          typename S,
          typename Char = char_t<S>,
          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& detail::is_exotic_char<Char>::value)>
auto vformat_to(OutputIt out, const S& format_str, basic_format_args<buffer_context<type_identity_t<Char>>> args) -> OutputIt
{
    auto&& buf = detail::get_buffer<Char>(out);
    detail::vformat_to(buf, detail::to_string_view(format_str), args);
    return detail::get_iterator(buf);
}

template <typename OutputIt,
          typename S,
          typename... Args,
          typename Char = char_t<S>,
          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& detail::is_exotic_char<Char>::value)>
inline auto format_to(OutputIt out, const S& fmt, Args&&... args) -> OutputIt
{
    return vformat_to(out, detail::to_string_view(fmt), fmt::make_format_args<buffer_context<Char>>(args...));
}

template <typename Locale,
          typename S,
          typename OutputIt,
          typename... Args,
          typename Char = char_t<S>,
          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& detail::is_locale<Locale>::value&& detail::is_exotic_char<Char>::value)>
inline auto vformat_to(OutputIt out, const Locale& loc, const S& format_str, basic_format_args<buffer_context<type_identity_t<Char>>> args) -> OutputIt
{
    auto&& buf = detail::get_buffer<Char>(out);
    vformat_to(buf, detail::to_string_view(format_str), args, detail::locale_ref(loc));
    return detail::get_iterator(buf);
}

template <typename OutputIt,
          typename Locale,
          typename S,
          typename... Args,
          typename Char = char_t<S>,
          bool enable = detail::is_output_iterator<OutputIt, Char>::value&& detail::is_locale<Locale>::value&& detail::is_exotic_char<Char>::value>
inline auto format_to(OutputIt out, const Locale& loc, const S& format_str, Args&&... args) -> typename std::enable_if<enable, OutputIt>::type
{
    return vformat_to(out, loc, to_string_view(format_str), fmt::make_format_args<buffer_context<Char>>(args...));
}

template <typename OutputIt,
          typename Char,
          typename... Args,
          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& detail::is_exotic_char<Char>::value)>
inline auto vformat_to_n(OutputIt out, size_t n, basic_string_view<Char> format_str, basic_format_args<buffer_context<type_identity_t<Char>>> args)
    -> format_to_n_result<OutputIt>
{
    detail::iterator_buffer<OutputIt, Char, detail::fixed_buffer_traits> buf(out, n);
    detail::vformat_to(buf, format_str, args);
    return {buf.out(), buf.count()};
}

template <typename OutputIt,
          typename S,
          typename... Args,
          typename Char = char_t<S>,
          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&& detail::is_exotic_char<Char>::value)>
inline auto format_to_n(OutputIt out, size_t n, const S& fmt, const Args&... args) -> format_to_n_result<OutputIt>
{
    return vformat_to_n(out, n, detail::to_string_view(fmt), fmt::make_format_args<buffer_context<Char>>(args...));
}

template <typename S, typename... Args, typename Char = char_t<S>, FMT_ENABLE_IF(detail::is_exotic_char<Char>::value)>
inline auto formatted_size(const S& fmt, Args&&... args) -> size_t
{
    detail::counting_buffer<Char> buf;
    detail::vformat_to(buf, detail::to_string_view(fmt), fmt::make_format_args<buffer_context<Char>>(args...));
    return buf.count();
}

inline void vprint(std::FILE* f, wstring_view fmt, wformat_args args)
{
    wmemory_buffer buffer;
    detail::vformat_to(buffer, fmt, args);
    buffer.push_back(L'\0');
    if (std::fputws(buffer.data(), f) == -1)
        FMT_THROW(system_error(errno, FMT_STRING("cannot write to file")));
}

inline void vprint(wstring_view fmt, wformat_args args) { vprint(stdout, fmt, args); }

template <typename... T> void print(std::FILE* f, wformat_string<T...> fmt, T&&... args)
{
    return vprint(f, wstring_view(fmt), fmt::make_wformat_args(args...));
}

template <typename... T> void print(wformat_string<T...> fmt, T&&... args) { return vprint(wstring_view(fmt), fmt::make_wformat_args(args...)); }

/**
  Converts *value* to ``std::wstring`` using the default format for type *T*.
 */
template <typename T> inline auto to_wstring(const T& value) -> std::wstring { return format(FMT_STRING(L"{}"), value); }
FMT_MODULE_EXPORT_END
FMT_END_NAMESPACE

#endif  // FMT_XCHAR_H_
